This metal roof had already been treated with a well known cut edge corrosion system, which had begun to fail in multiple areas due to water becoming trapped between the overlapping roof sheets, which had been sealed with silicone sealant. Flexlap system is made from a specially hardened silicone, designed to resist environmental dirt pick-up as well as providing a much smoother finish. Liquasil does not recommend that the gap between overlapping roof sheets is sealed. Any moisture that might be present can escape or evaporate naturally, which is how built-up steel profile roofs are designed to work.
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